CN110127852B - Longitudinal matrix filled reciprocating subsurface flow constructed wetland and application thereof - Google Patents

Longitudinal matrix filled reciprocating subsurface flow constructed wetland and application thereof Download PDF

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CN110127852B
CN110127852B CN201910514254.8A CN201910514254A CN110127852B CN 110127852 B CN110127852 B CN 110127852B CN 201910514254 A CN201910514254 A CN 201910514254A CN 110127852 B CN110127852 B CN 110127852B
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tank body
water
water inlet
matrix
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CN110127852A (en
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徐晓寒
王惠
杨宝山
王树志
来晓双
袁英睿
李峰
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University of Jinan
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/163—Nitrates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a reciprocating subsurface flow constructed wetland filled with a longitudinal matrix, which comprises a tank body, wherein the tank body is of a groove-shaped structure with an open top, and the matrix is filled in the tank body; the substrate is a basic layer, a generating layer, a blocking layer and a planting layer from bottom to top; the generating layer at least comprises two matrixes which are longitudinally filled in sequence from left to right; a water inlet pipe extending along the horizontal direction is arranged at the upper part of the tank body, and the bottom of the tank body is connected with a water outlet pipe; at least one layered partition plate with one side inclined downwards is arranged in the generation layer, one side with a high position of the layered partition plate is clung to the tank body, and one side with a low position is spaced from the tank body. The invention can lead sewage to pass through different matrixes in different orders to form reciprocating water flow, thus leading sewage to be uniformly mixed during hydraulic retention, avoiding the phenomenon of hydraulic retention layering and enhancing the nitrogen removal performance of microorganisms.

Description

Longitudinal matrix filled reciprocating subsurface flow constructed wetland and application thereof
Technical Field
The invention relates to the technical field of artificial wetlands, in particular to a longitudinal matrix filled reciprocating subsurface flow artificial wetland and application thereof.
Background
With the development of society and the improvement of the living standard of people, the production amount of domestic sewage is increased increasingly, the phenomenon of random discharge is serious, and not only is water resource wasted, but also environmental pollution is caused. The constructed wetland is used as a novel sewage treatment process, has the advantages of simple structure, easy maintenance, low treatment cost, landscape effect and the like, plays an important role in sewage treatment and ecological environment protection, and has good popularization value.
The constructed wetland mainly comprises 3 parts: matrix, plant and microorganism. The matrix plays a role in 3 aspects in the constructed wetland: the surface to which the microorganism grows, the carrier and nutrient source for the aquatic plant to grow, and the sewage is purified by physical and chemical actions (such as adsorption, filtration, ion exchange, etc.). The application types of the constructed wetland mainly comprise a single type and a compound type, wherein the compound type constructed wetland mainly comprises two types of horizontal undercurrent matched with uplink vertical current and vertical current matched with horizontal undercurrent, sewage in the existing operation mode enters in a given sequence, hydraulic retention delamination is obvious, nitrogen removal performance is reduced, and carbon sources in the sewage are continuously consumed within the hydraulic retention time, so that the nitrogen removal performance is further reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a longitudinal matrix filled reciprocating subsurface flow constructed wetland and application thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a reciprocating subsurface flow constructed wetland filled with a longitudinal matrix, which comprises a tank body, wherein the tank body is of a groove-shaped structure with an open top, and the matrix is filled in the tank body; the substrate is a basic layer, a generating layer, a blocking layer and a planting layer from bottom to top; the generating layer at least comprises two matrixes which are longitudinally filled in sequence from left to right; a water inlet pipe extending along the horizontal direction is arranged at the upper part of the tank body, and the bottom of the tank body is connected with a water outlet pipe; at least one layered partition plate with one side inclined downwards is arranged in the generation layer, one side with a high position of the layered partition plate is clung to the tank body, and one side with a low position is spaced from the tank body.
Preferably, the grain size of the matrix meets the requirement that the basic layer is more than the generating layer is more than the blocking layer is more than the planting layer, and the matrix is mainly the generating layer.
The foundation layer is positioned at the lowest end of the inner part of the pond body, the gravel with larger grain diameter is selected, the gap is larger, the supporting effect is realized on the substrate of the upper layer, the integral mechanical strength of the constructed wetland is enhanced, the stability of the structure is improved, and suspended particles in the water body can be deposited at the lowest layer.
The blocking layer is made of quartz sand with smaller grain diameter and weak water absorption, and is arranged at the lower side of the planting layer, so that the defect that soil of the planting layer leaks to the lower layer along with water flow to cause blockage is effectively prevented.
Wherein the grain diameter of the gravel is 15-25 mm, the thickness is 60-80 mm, the grain diameter of the quartz sand is 2-5 mm, the thickness is 40-60 mm, and the thickness of farmland soil is 60-80 mm.
Preferably, the generation layer comprises three matrixes, namely waste bricks, zeolite and volcanic rock in sequence from left to right.
Preferably, the thickness of the generating layer is 300-400 mm, and the particle sizes of the waste bricks, zeolite and volcanic rock are all 8-15 mm; the width of the matrix waste bricks is 130-180 mm, the width of the matrix zeolite is 180-250 mm, and the width of the matrix volcanic rock is 130-180 mm.
The thickness of the generating layer is higher, and the zeolite is a main matrix layer, has a developed micropore structure and can effectively adsorb and degrade pollutants in water; the waste bricks are used as the constructed wetland matrix filler, have stronger adsorptivity, can generally improve the removal efficiency of the wetland on ammonium nitrogen and total nitrogen, realize the resource utilization of the waste bricks, and have important significance for developing circular economy and protecting environment; the volcanic rock surface is rough and microporous, and the characteristics are particularly suitable for the growth and propagation of microorganisms on the surface of the volcanic rock surface to form a biological film.
Preferably, three layered separators are arranged in the generation layer, the three layered separators are arranged in a staggered and inclined mode, and the three layered separators divide the generation layer into four layers. The layered separator is made of organic glass, and has a length of 350-450 mm and a width of 250-350 mm.
Preferably, the water inlet pipe is located in the barrier layer, the water inlet pipe comprises a water inlet main pipe and a water inlet branch pipe which are perpendicular to each other and are communicated, at least one water inlet branch pipe is arranged, and a plurality of water dispersing holes facing downwards are formed in the water inlet main pipe and the water inlet branch pipe. The diameter of the water scattering holes is 2-3 mm, the distance between every two adjacent water scattering holes is 30-50 mm, and water can be uniformly fed into the tank body through the water scattering holes.
The main water inlet pipe, the branch water inlet pipe and the water outlet pipe are all PVC pipes, the inner diameters of the main water inlet pipe and the branch water inlet pipe are 20mm, and the inner diameter of the water outlet pipe is 20-35 mm.
Preferably, the water inlet pipe is connected with the aeration device through a pipeline, and the aeration device is arranged at a water inlet source outside the tank body. Suspended particles which are deposited at the bottom of the tank body are prevented from suspending again, and once damaged, the aeration device is simple and rapid to replace, and the existing aeration equipment is adopted.
The water inlet of the water inlet pipe is positioned at the upper part of the left side of the tank body, the right side of the bottom of the tank body is connected with the water outlet pipe, and the higher side of the layered partition plate is positioned at the left side or the right side.
The aeration device is arranged at a water inlet source, so that the sewage to be introduced into the tank body is rich in oxygen, the oxygen-rich sewage enters the tank body through a main water inlet pipe, the water flow is dispersed into a plurality of water flows through water scattering holes, the water flow enters the generation layer through the blocking layer under the action of gravity, and the water flow flows back and forth from left to right and right to left in the generation layer under the blocking of the layered partition plate, and passes through different longitudinal matrixes in different orders. The substrates with different characteristics are helpful for forming biological films with different properties, and water flows through the substrates in different sequences, so that the nitrogen removal performance of microorganisms can be enhanced.
Preferably, a water level observation pipe is arranged at the bottom of the tank body above the water outlet pipe, and a water level regulating valve is arranged on the water level observation pipe and comprises a high water level regulating valve, a medium water level regulating valve and a low water level regulating valve which are positioned at different heights.
The water level observation tube is the same as Chi Tigao degrees, is a transparent organic glass round tube with the diameter of 15-30 mm, and is used for adjusting the water level height and drainage in the tank body. The water level observation pipe is used for observing the change of the water level height in the tank body, and the water level regulating valve is used for regulating the water level height in the tank body and draining water.
Preferably, the outer surface of the tank body is blacked by black paint, the periphery of the tank body is covered with a light shielding layer, and the light shielding layer is white glass fiber grid cloth. The black paint can effectively prevent direct sunlight, avoid negative influence of illumination on the action of microorganisms in the wetland tank body, and simultaneously select white glass fiber grid cloth as a light shielding layer, so that the stability of the system can be enhanced, and the phenomenon that the water temperature rises due to the fact that the tank body absorbs illumination heat is avoided.
The tank body and the layered partition plates are made of organic glass, the organic glass is high in mechanical strength, certain in heat resistance and cold resistance, corrosion resistance and good in insulating property;
in a second aspect of the invention, a method for treating sewage by using the artificial wetland is provided, when sewage is treated for the first time, sewage to be treated enters a blocking layer in a tank body through a main water inlet pipe, the sewage descends into a generating layer, water flows in the generating layer from left to right and from right to left in a reciprocating manner through the blocking of a layered partition plate, and flows in different sequences through different matrixes to form reciprocating water flow, and when the water level is in a high water level regulating valve, water inlet is stopped; the water is discharged to the medium water level regulating valve through the water outlet pipe in the next day, the water is stopped, the water is fed to the high water level regulating valve again, and the water is stopped; and then the water outlet and the water inlet are repeated every day to achieve stable operation.
The artificial wetland provided by the invention is used for treating sewage, the operation method is simple and feasible, and when the artificial wetland is stably operated, the hydraulic retention time of 2-3 days can be maintained for each water inflow, so that a certain time is provided for the precipitation of pollutants in the sewage, the adsorption of matrixes, the microbial degradation and the plant absorption; each time the water inlet is oxygen-enriched sewage, the sequencing batch water inlet and outlet enables the lower layer of the wetland to be in an anoxic environment, an anaerobic zone is formed, the upper layer of the wetland is in an oxygen-enriched environment, an aerobic zone is formed, the sequencing batch water inlet is used for periodically discharging water and feeding water in the hydraulic retention time to timely supplement fresh carbon sources, and the problem that the nitrogen removal performance is reduced due to the lack of the carbon sources in the later stage of long hydraulic retention of the sewage with low carbon nitrogen ratio is avoided.
The invention has the beneficial effects that:
(1) The longitudinal matrix filling method can separate the matrixes clearly, water flows into the tank body to enable the water body to be in contact with various matrixes, biological films with different characteristics can be formed in different matrixes, the defect that the water body cannot be in contact with the upper-layer matrixes under the condition of low water level in the traditional layered filling method is avoided, and the nitrogen removal performance is improved.
(2) The sewage is rich in oxygen through aeration equipment, oxygen-rich sewage passes through the main pipe that intakes and gets into the cell body inside, the water scattering hole disperses into the multistrand rivers with the rivers under the action of gravity, the rivers realize downstream vertical flow, follow the continuation of intaking, get into the zone through the barrier layer, under the barrier of layering baffle, rivers are left to right, from left to left reciprocating flow in the zone, with different order process different stroma, form reciprocating type rivers flow, mix when can making sewage water conservancy stay like this, avoid the water conservancy to stop layering phenomenon, the microorganism nitrogen removal performance is strengthened.
(3) The size of the grain diameter of the matrix in the pond body satisfies the conditions that the basic layer is larger than the generation layer and larger than the blocking layer is larger than the planting layer, so that suspended particles in the water body can be precipitated to the lowest layer, the pond body is not easy to block, and the blocking problem is alleviated.
(4) The foundation layer is positioned at the lowest end of the inner part of the pond body, hard material gravel with larger grain diameter and larger gap are selected, so that the foundation layer plays a role in supporting an upper substrate, the integral mechanical strength of the constructed wetland is enhanced, the structural stability is improved, and suspended particles in the water body can be deposited at the lowest layer; the thickness of the generating layer is higher, and the zeolite is a main matrix layer, has a developed micropore structure and can effectively adsorb and degrade pollutants in water; the waste bricks are used as the constructed wetland matrix filler, have stronger adsorptivity, can generally improve the removal efficiency of the wetland on ammonium nitrogen and total nitrogen, realize the resource utilization of the waste bricks, and have important significance for developing circular economy and protecting environment; the volcanic rock surface is rough and microporous, and the characteristics are particularly suitable for the growth and propagation of microorganisms on the surface of the volcanic rock surface to form a biological film; the blocking layer is made of quartz sand with smaller grain size and weak water absorption, and is arranged on the lower side of the planting layer, so that the defect that soil of the planting layer leaks to the lower layer along with water flow to cause blockage is effectively prevented, farmland soil is adopted in the planting layer, and good nutrition and space conditions are provided for plant growth.
Drawings
FIG. 1 is a schematic diagram of a cell structure according to the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic view of the structure of the water inlet pipe of the present invention;
in the figure: 1. the water tank comprises a tank body, 21, a water inlet main pipe, 22, a water inlet branch pipe, 23, a water dispersing hole, 3, a water outlet pipe, 4, a water level observation pipe, 51, a low water level regulating valve, 52, a medium water level regulating valve, 53, a high water level regulating valve, 6, a layered partition board, 7, a base layer, 81, waste bricks, 82, zeolite, 83, volcanic rocks, 9, a barrier layer, 10, a planting layer, 11 and plants.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
As shown in fig. 1 and 2, the reciprocating subsurface flow constructed wetland filled with a longitudinal matrix comprises a tank body 1, wherein the tank body 1 is of a groove-shaped structure with an open top. The cell body 1 is a cube made of a piece of plexiglass having a thickness of 5mm and having dimensions of length x width x height=500 mm x 400mm x 550mm and a volume of 110L. The periphery of the tank body 1 is coated with black ink, and the periphery of the tank body 1 is covered with a light shielding layer, wherein the light shielding layer is white glass fiber mesh cloth with the thickness of 2 mm.
The cell body 1 is filled with a matrix, and the matrix comprises a base layer 7, a generating layer, a barrier layer 9 and a planting layer 10 from bottom to top. The foundation layer 7 is gravel, the barrier layer 9 is quartz sand, and the planting layer 10 is farmland soil. The generation layer comprises three matrixes, namely waste bricks 81, zeolite 82 and volcanic rock 83 from left to right. The grain size of the matrix meets the conditions that the base layer 7 is more than the generation layer 9 is more than the barrier layer 10, and the generation layer is the main matrix.
Wherein the filling thickness of the foundation layer 7 is 50mm, the filling thickness of the generating layer is 350mm, the filling thickness of the barrier layer 9 is 50mm, and the filling thickness of the planting layer 10 is 80mm. The particle size of the gravel is 15-25 mm, the particle sizes of the waste bricks 81, the zeolite 82 and the volcanic rocks 83 are 8-15 mm, and the particle size of the quartz sand is 2-5 mm. The width of the matrix waste bricks 81 is 150mm, the width of the matrix zeolite 82 is 200mm, and the width of the matrix volcanic rock 83 is 150mm. Reed is selected as plant, planted on the planting layer 10, and planted in 2 rows of 3 plants each, 6 plants.
Three layered separation plates 6 are arranged in the generation layer, the three layered separation plates 6 are arranged in a staggered and inclined mode, one side of each layered separation plate 6 with a higher position is clung to the tank body 1, one side with a lower position is spaced from the tank body 1, and the three layered separation plates 6 divide the generation layer into four layers. Each layered separator 6 is made of plexiglas, and has a length of 400mm and a width of 300mm.
A water inlet pipe extending along the horizontal direction is arranged at the upper part of the tank body 1, and the bottom of the tank body 1 is connected with a water outlet pipe 3; the inlet pipe is located in the barrier layer 9. As shown in fig. 3, the water inlet pipe comprises a water inlet main pipe 21 and water inlet branch pipes 22 which are mutually vertical and communicated, two water inlet branch pipes 22 are provided, and a plurality of downward water dispersing holes 23 are formed in the water inlet main pipe 21 and the water inlet branch pipes 22. The water inlet of the water inlet main pipe 21 is arranged at the position of the side surface of the tank body 1, which is 100mm away from the top, the length of the water inlet main pipe 21 is 450mm, the length of each water inlet branch pipe 22 is 350mm, the distance between every two adjacent water scattering holes 23 is 40mm, and the diameter of each water scattering hole 23 is 3mm. The water inlet main pipe 21, the water inlet branch pipe 22 and the water outlet pipe 3 are all PVC pipes, the inner diameters of the water inlet main pipe 21 and the water inlet branch pipe 22 are 20mm, the inner diameter of the water outlet pipe 3 is 35mm, and the water outlet pipe 3 is positioned at a position 20mm away from the bottom of the pool.
The water inlet pipe is connected with the aeration device through a pipeline, and the aeration device is arranged at a water inlet source outside the tank body 1. Suspended particles which are deposited at the bottom of the tank body 1 are prevented from suspending again, and once damaged, the aeration device is simple and rapid to replace, and the existing aeration equipment is adopted.
The water inlet of the water inlet pipe is positioned at the upper part of the left side of the tank body 1, the water outlet pipe 3 is connected to the right side of the bottom of the tank body 1, and the higher side of the layered partition plate 6 is positioned at the left side or the right side.
The aeration device is arranged at the water inlet source to enable the sewage to be in the tank body 1 to be rich in oxygen, the rich oxygen sewage enters the tank body 1 through the water inlet main pipe 21, the water scattering holes 23 disperse the water flow into a plurality of water flows, the water flow enters the generation layer through the blocking layer 9 under the action of gravity, and the water flow flows reciprocally from left to right to left in the generation layer under the blocking of the layered partition 6, and passes through different longitudinal matrixes in different sequences. The substrates with different characteristics are favorable for forming biological films with different properties, and water flows through the substrates in different sequences, so that the nitrogen removal performance of microorganisms can be enhanced, and various pollutants can be removed.
The bottom of the tank body 1 above the water outlet pipe 3 is provided with a water level observation pipe 4, the water level observation pipe 4 is positioned at a position 50mm above the water outlet pipe 3, the lower end of the water level observation pipe 4 is provided with a low water level regulating valve 51, the water level observation pipe 4 higher than the low water level regulating valve 51 by 180mm is provided with a medium water level regulating valve 52, and the water level observation pipe 4 higher than the medium water level regulating valve 52 by 180mm is provided with a high water level regulating valve 53. The water level observation tube 4 is the same as the height of the tank body 1, the water level observation tube 4 is a transparent organic glass circular tube with the diameter of 15-30 mm, the water level observation tube 4 is used for observing the change of the water level height in the tank body 1, and the water level regulating valve is used for regulating the water level height in the tank body 1 and draining water.
By utilizing the method for treating sewage by the constructed wetland, during the first sewage treatment, the sewage to be treated enters the blocking layer 9 in the tank body 1 through the water inlet main pipe 21, the sewage descends into the generating layer, and the water flows in the generating layer from left to right and from right to left in a reciprocating manner through the blocking of the layered partition plate 6, and flows through different matrixes in different orders to form reciprocating water flow, and when the water level is in the high water level regulating valve 53, the water inlet is stopped; water is discharged to the medium water level regulating valve 52 through the water outlet pipe 3 for the next day, water is stopped from being discharged, water is again fed to the high water level regulating valve 53, and water is stopped from being fed; the water outlet and inlet are repeated daily thereafter.
Sewage treatment detection experiment
After the first water outlet for 3 days (after stable operation), short, medium and long three-period experiments are carried out to test the nitrogen removal performance and the stability of the constructed wetland sewage treatment. The short-term experiment in the first period is 5 days, the middle-term experiment in the second period is 10 days, the long-term experiment in the third period is 30 days, and the effluent quality is monitored every day. The sewage is manually configured by the inflow water, and the indexes of each pollutant are respectively as follows: NH4 + ：30mg/L，NO3 — :15mg/L, TN:30.52mg/L, COD:135mg/L, belongs to sewage with low carbon nitrogen ratio.
The following table shows experimental data obtained from the three-stage experimental wastewater treatment test performed on this example:
Figure GDA0004118613150000091
from the above table it can be found that: NH (NH) 4 + The removal effect is stable in a three-stage experiment with TN, and the removal rate of nearly 90% and nearly 40% can be respectively achieved, NO 3 — The removal effect with COD is enhanced along with the operation time of the wetland, and the removal rates of 83% and 81% can be respectively achieved.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (2)

1. The reciprocating subsurface flow constructed wetland filled with the longitudinal matrix comprises a pool body (1), wherein the pool body (1) is of a groove-shaped structure with an open top, and the matrix is filled in the pool body (1); the method is characterized in that: the substrate is a basic layer (7), a generating layer, a barrier layer (9) and a planting layer (10) from bottom to top; the generating layer comprises three matrixes which are sequentially longitudinally filled from left to right; a water inlet pipe extending along the horizontal direction is arranged at the upper part of the tank body (1), and the bottom of the tank body (1) is connected with a water outlet pipe (3); three layering partition plates (6) with one side inclined downwards are arranged in the generation layer, one side with the high position of the layering partition plates (6) is clung to the tank body (1), and the other side with the low position is spaced from the tank body (1);
the grain size of the matrix meets the requirement that the base layer (7) > the generation layer > the barrier layer (9) > the planting layer (10), and the matrix is mainly the generation layer;
the foundation layer (7) is gravel, the barrier layer (9) is quartz sand, and the planting layer (10) is farmland soil;
the three matrixes of the generation layer are waste bricks (81), zeolite (82) and volcanic rocks (83) in sequence from left to right;
the thickness of the generation layer is 300-400 mm, and the particle sizes of the waste bricks (81), the zeolite (82) and the volcanic rocks (83) are 8-15 mm; the width of the matrix waste bricks (81) is 130-180 mm, the width of the matrix zeolite (82) is 180-250 mm, and the width of the matrix volcanic rock (83) is 130-180 mm;
three layered separators (6) in the generation layer are arranged in a staggered and inclined mode, and the three layered separators (6) divide the generation layer into four layers;
the water inlet pipe is positioned in the barrier layer (9), the water inlet pipe comprises a water inlet main pipe (21) and water inlet branch pipes (22) which are mutually vertical and communicated, at least one water inlet branch pipe (22) is arranged, and a plurality of downward water dispersing holes (23) are formed in the water inlet main pipe (21) and the water inlet branch pipes (22);
the water inlet pipe is connected with an aeration device through a pipeline, and the aeration device is arranged at a water inlet source outside the tank body (1);
the water level monitoring device comprises a water level monitoring pipe (4) arranged at the bottom of a tank body (1) above a water outlet pipe (3), and water level regulating valves arranged on the water level monitoring pipe (4), wherein each water level regulating valve comprises a high water level regulating valve (53), a medium water level regulating valve (52) and a low water level regulating valve (51) which are arranged at different heights.
2. A method for treating sewage by using the constructed wetland according to claim 1, which is characterized in that: sewage to be treated enters the blocking layer (9) in the tank body (1) through the water inlet pipe, the sewage descends into the generating layer, and flows from left to right and from right to left in the generating layer in a reciprocating manner through the blocking of the layered partition plate (6), and flows through different matrixes in different orders to form reciprocating water flow, and finally flows out through the water outlet pipe (3).
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CN105565498A (en) * 2015-12-24 2016-05-11 北京林业大学 System and method for removing nitrogen and phosphorus in enhanced manner by aid of parallel horizontal subsurface flow artificial wetlands
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